import java.util.HashSet;
import java.util.Set;

/**
 * Created by zhourh on 2018/5/24.
 * 国际摩尔斯密码定义一种标准编码方式，将每个字母对应于一个由一系列点和短线组成的字符串， 比如: "a" 对应 ".-", "b" 对应 "-...", "c" 对应 "-.-.", 等等。

 为了方便，所有26个英文字母对应摩尔斯密码表如下：

 [".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--.."]
 给定一个单词列表，每个单词可以写成每个字母对应摩尔斯密码的组合。例如，"cab" 可以写成 "-.-.-....-"，(即 "-.-." + "-..." + ".-"字符串的结合)。我们将这样一个连接过程称作单词翻译。

 返回我们可以获得所有词不同单词翻译的数量。

 例如:
 输入: words = ["gin", "zen", "gig", "msg"]
 输出: 2
 解释:
 各单词翻译如下:
 "gin" -> "--...-."
 "zen" -> "--...-."
 "gig" -> "--...--."
 "msg" -> "--...--."

 共有 2 种不同翻译, "--...-." 和 "--...--.".

 直接利用了Set的去重功能
 */
public class UniqueMorseCodeWords {

    private static String[] morseChars = new String[]{".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",
            ".-..","--","-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--.."};

    public static void main(String[] args) {
        String[] words = new String[]{"gin", "zen", "gig", "msg"};
        System.out.println(new UniqueMorseCodeWords().uniqueMorseRepresentations(words));
    }

    public int uniqueMorseRepresentations(String[] words) {
        Set<String> morses = new HashSet<>();
        if (words != null) {
            for (String word : words) {
                morses.add(getMorse(word));
            }
        }

        return morses.size();
    }

    private String getMorse(String word) {
        StringBuilder morse = new StringBuilder("");
        if (word == null) {
            return morse.toString();
        }

        for (char c : word.toCharArray()) {
            if (c >= 'a' && c <= 'z') {
                morse.append(morseChars[c - 'a']);
            }
        }

        return morse.toString();
    }


}
